If Dick Grayson was not in FC or RIP or the first three-quarters of BftC and then finally showed up at the same time as Bruce and was like "wait I thought you were dead," that would be like this.
Not my favourite example, since Dick was hardly in RIP, and not much use when he was there (Posing dramatically with the Batcowl watching the helicopter crash and moaning about Bruce being dead with absolutely NO evidence whatsoever to support it). And as for FC, he and Tim were in two sodding panels of the entire sodding miniseries, and their entire contribution consisted of standing around listening to Alan Scott prattle on. After that... no clue as to what they were doing and not even a cameo when Batdad WAS killed)
Ahem, sorry, hot button.
And that's an interesting notion for Genocide's origin, but I confess I am always distrustful of time travel stories (Since it tends to lead to a whole mess of foreshadowing after the fact, and the "Teen Titans of the Future go EEEEVIL" is too recent a lingering annoying memory for me to be entirely comfortable with it as an idea. Still I have more faith in Gail than I do in Geoff Johns.